The technique where a system clock generates interrupts, and at each clock interrupt the os regains control and assigns the processor to another user, is .

Time slicing

Explanation:

 Time slicing is one of the technique that basically implement the multitasking in the operating system. It basically generate the interrupt and at the each clock of the interrupt in the operating system basically regain  control and then assign that particular system or processor to the another user.

Time slice are typically work in milliseconds. By using the multi users system, the time slice is the total amount of the processing time for the each user get assigned.